﻿// --------------------------------------------------------------------------------------------------------------------
// <copyright file="StrongTypedCollectionConversionConsumer.cs" company="DHGMS Solutions">
//   Copyright 2004-2014 DHGMS Solutions.
//      
//   Licensed under the Apache License, Version 2.0 (the "License");
//   you may not use this file except in compliance with the License.
//   You may obtain a copy of the License at
//      
//   http://www.apache.org/licenses/LICENSE-2.0
//      
//   Unless required by applicable law or agreed to in writing, software
//   distributed under the License is distributed on an "AS IS" BASIS,
//   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//   See the License for the specific language governing permissions and
//   limitations under the License.
// </copyright>
// <summary>
//   
// </summary>
// --------------------------------------------------------------------------------------------------------------------

using System.Threading.Tasks;

namespace Dhgms.TplHelper.Model.Consumer
{
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;

    using Dhgms.TplHelper.Model.Info.TaskResult;

    /// <summary>
    /// Consumer for changing a strongly typed collection from one type to another
    /// </summary>
    public abstract class StrongTypedCollectionConversionConsumer<TSourceType, TTargetType> : ITaskDataResult<IList<TTargetType>>
    {
        /// <summary>
        /// Gets the data.
        /// </summary>
        public IList<TTargetType> Data { get; set; }

        /// <summary>
        /// Consumes the source collection
        /// </summary>
        /// <param name="sourceCollection">The source collection data to consume.</param>
        public Task<long> Consume(IList<TSourceType> sourceCollection)
        {
            this.Data = sourceCollection.Select(this.GetConvertedRow).ToList();
            return Task.FromResult<long>(Data.Count);
        }

        /// <summary>
        /// Converts a row from one type to another
        /// </summary>
        /// <param name="sourceRow">The record to convert</param>
        /// <returns>The converted record</returns>
        protected abstract TTargetType GetConvertedRow(TSourceType sourceRow);
    }
}
